How do you import images onto planes using nodes
There is an add-on that allows you to automatically import an image as a plane:

when you use it to import an image it creates a plane of the right aspect ratio and a shader that displays the image:

If you want to change the image, so long as it has the same aspect ratio, all you have to do is click on the file folder and select a new image.

It can't get any easier than that